update on typos

This commit is contained in:
Morten Hjorth-Jensen
2023-09-19 09:53:16 +02:00
parent 47843ca480
commit 752365eafb
3 changed files with 82 additions and 72 deletions
+20 -16
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@@ -2,7 +2,7 @@
"cells": [
{
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@@ -14,7 +14,7 @@
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{
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@@ -27,7 +27,7 @@
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{
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@@ -45,7 +45,7 @@
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@@ -57,7 +57,7 @@
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@@ -76,7 +76,7 @@
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@@ -88,7 +88,7 @@
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@@ -97,24 +97,25 @@
"\n",
"Show that you can rewrite this in terms of a term which contains the variance of the model itself (the so-called variance term), a\n",
"term which measures the deviation from the true data and the mean value of the model (the bias term) and finally the variance of the noise.\n",
"\n",
"That is, show that"
]
},
{
"cell_type": "markdown",
"id": "ae9ebea0",
"id": "046ec084",
"metadata": {
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"source": [
"$$\n",
"\\mathbb{E}\\left[(\\boldsymbol{y}-\\boldsymbol{\\tilde{y}})^2\\right]=(\\mathrm{Bias}[\\tilde{y}])^2+\\mathrm{var}[\\tilde{f}]+\\sigma^2,\n",
"\\mathbb{E}\\left[(\\boldsymbol{y}-\\boldsymbol{\\tilde{y}})^2\\right]=\\mathrm{Bias}[y]+\\mathrm{var}[\\tilde{y}]+\\sigma^2,\n",
"$$"
]
},
{
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"metadata": {
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@@ -124,19 +125,19 @@
},
{
"cell_type": "markdown",
"id": "d2e1f899",
"id": "7ab1bc0e",
"metadata": {
"editable": true
},
"source": [
"$$\n",
"(\\mathrm{Bias}[\\tilde{y}])^2=\\left(\\boldsymbol{y}-\\mathbb{E}\\left[\\boldsymbol{\\tilde{y}}\\right]\\right)^2,\n",
"\\mathrm{Bias}[y]=\\mathbb{E}\\left[\\left(\\boldsymbol{y}-\\mathbb{E}\\left[\\boldsymbol{\\tilde{y}}\\right]\\right)^2\\right],\n",
"$$"
]
},
{
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"id": "a8da71db",
"metadata": {
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@@ -146,23 +147,26 @@
},
{
"cell_type": "markdown",
"id": "86746df2",
"id": "b74aa5e4",
"metadata": {
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},
"source": [
"$$\n",
"\\mathrm{var}[\\tilde{f}]=\\frac{1}{n}\\sum_i(\\tilde{y}_i-\\mathbb{E}\\left[\\boldsymbol{\\tilde{y}}\\right])^2.\n",
"\\mathrm{var}[\\tilde{y}]=\\frac{1}{n}\\sum_i(\\tilde{y}_i-\\mathbb{E}\\left[\\boldsymbol{\\tilde{y}}\\right])^2.\n",
"$$"
]
},
{
"cell_type": "markdown",
"id": "9aa6d3dc",
"id": "de559d80",
"metadata": {
"editable": true
},
"source": [
"The answer to this exercise should be included in the theory part of the report. This exercise is also part of the weekly exercises of week 37.\n",
"Explain what the terms mean and discuss their interpretations.\n",
"\n",
"Explain what the terms mean and discuss their interpretations.\n",
"\n",
"Perform then a bias-variance analysis of a simple one-dimensional (or other models of your choice) function by\n",
+53 -53
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@@ -2,7 +2,7 @@
"cells": [
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@@ -14,7 +14,7 @@
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{
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@@ -27,7 +27,7 @@
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@@ -63,7 +63,7 @@
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@@ -85,7 +85,7 @@
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@@ -100,7 +100,7 @@
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@@ -133,7 +133,7 @@
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@@ -185,7 +185,7 @@
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@@ -207,7 +207,7 @@
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@@ -220,7 +220,7 @@
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@@ -232,7 +232,7 @@
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@@ -244,7 +244,7 @@
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@@ -254,7 +254,7 @@
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@@ -266,7 +266,7 @@
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@@ -295,7 +295,7 @@
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@@ -313,7 +313,7 @@
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@@ -330,7 +330,7 @@
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@@ -346,7 +346,7 @@
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@@ -358,7 +358,7 @@
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@@ -369,7 +369,7 @@
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@@ -381,7 +381,7 @@
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@@ -393,7 +393,7 @@
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@@ -405,7 +405,7 @@
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@@ -416,7 +416,7 @@
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@@ -428,7 +428,7 @@
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@@ -441,7 +441,7 @@
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@@ -453,7 +453,7 @@
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@@ -463,7 +463,7 @@
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@@ -475,7 +475,7 @@
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@@ -486,7 +486,7 @@
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@@ -519,7 +519,7 @@
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@@ -531,7 +531,7 @@
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@@ -550,7 +550,7 @@
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@@ -562,7 +562,7 @@
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@@ -576,19 +576,19 @@
},
{
"cell_type": "markdown",
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"metadata": {
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"source": [
"$$\n",
"\\mathbb{E}\\left[(\\boldsymbol{y}-\\boldsymbol{\\tilde{y}})^2\\right]=(\\mathrm{Bias}[\\tilde{y}])^2+\\mathrm{var}[\\tilde{f}]+\\sigma^2,\n",
"\\mathbb{E}\\left[(\\boldsymbol{y}-\\boldsymbol{\\tilde{y}})^2\\right]=\\mathrm{Bias}[y]+\\mathrm{var}[\\tilde{y}]+\\sigma^2,\n",
"$$"
]
},
{
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@@ -598,19 +598,19 @@
},
{
"cell_type": "markdown",
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"metadata": {
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"source": [
"$$\n",
"(\\mathrm{Bias}[\\tilde{y}])^2=\\left(\\boldsymbol{y}-\\mathbb{E}\\left[\\boldsymbol{\\tilde{y}}\\right]\\right)^2,\n",
"\\mathrm{Bias}[y]=\\mathbb{E}\\left[\\left(\\boldsymbol{y}-\\mathbb{E}\\left[\\boldsymbol{\\tilde{y}}\\right]\\right)^2\\right],\n",
"$$"
]
},
{
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"metadata": {
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@@ -620,19 +620,19 @@
},
{
"cell_type": "markdown",
"id": "3235550b",
"id": "5b4668fd",
"metadata": {
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},
"source": [
"$$\n",
"\\mathrm{var}[\\tilde{f}]=\\frac{1}{n}\\sum_i(\\tilde{y}_i-\\mathbb{E}\\left[\\boldsymbol{\\tilde{y}}\\right])^2.\n",
"\\mathrm{var}[\\tilde{y}]=\\frac{1}{n}\\sum_i(\\tilde{y}_i-\\mathbb{E}\\left[\\boldsymbol{\\tilde{y}}\\right])^2.\n",
"$$"
]
},
{
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@@ -651,7 +651,7 @@
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@@ -676,7 +676,7 @@
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@@ -704,7 +704,7 @@
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@@ -716,7 +716,7 @@
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@@ -728,7 +728,7 @@
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@@ -754,7 +754,7 @@
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@@ -779,7 +779,7 @@
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@@ -793,7 +793,7 @@
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@@ -823,7 +823,7 @@
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@@ -845,7 +845,7 @@
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+9 -3
View File
@@ -39,24 +39,28 @@ Here the expected value $\mathbb{E}$ is the sample value.
Show that you can rewrite this in terms of a term which contains the variance of the model itself (the so-called variance term), a
term which measures the deviation from the true data and the mean value of the model (the bias term) and finally the variance of the noise.
That is, show that
!bt
\[
\mathbb{E}\left[(\bm{y}-\bm{\tilde{y}})^2\right]=(\mathrm{Bias}[\tilde{y}])^2+\mathrm{var}[\tilde{f}]+\sigma^2,
\mathbb{E}\left[(\bm{y}-\bm{\tilde{y}})^2\right]=\mathrm{Bias}[y]+\mathrm{var}[\tilde{y}]+\sigma^2,
\]
!et
with
!bt
\[
(\mathrm{Bias}[\tilde{y}])^2=\left(\bm{y}-\mathbb{E}\left[\bm{\tilde{y}}\right]\right)^2,
\mathrm{Bias}[y]=\mathbb{E}\left[\left(\bm{y}-\mathbb{E}\left[\bm{\tilde{y}}\right]\right)^2\right],
\]
!et
and
!bt
\[
\mathrm{var}[\tilde{f}]=\frac{1}{n}\sum_i(\tilde{y}_i-\mathbb{E}\left[\bm{\tilde{y}}\right])^2.
\mathrm{var}[\tilde{y}]=\frac{1}{n}\sum_i(\tilde{y}_i-\mathbb{E}\left[\bm{\tilde{y}}\right])^2.
\]
!et
The answer to this exercise should be included in the theory part of the report. This exercise is also part of the weekly exercises of week 37.
Explain what the terms mean and discuss their interpretations.
Explain what the terms mean and discuss their interpretations.
@@ -70,3 +74,5 @@ You can follow the code example in the jupyter-book at URL:"https://compphysics.
See also the whiteboard notes from week 37 at URL:"https://github.com/CompPhysics/MachineLearning/blob/master/doc/HandWrittenNotes/2023/NotesSep14.pdf"